Error parsing MDX:
[next-mdx-remote] error compiling MDX:
Unexpected character `!` (U+0021) before name, expected a character that can start a name, such as a letter, `$`, or `_` (note: to create a comment in MDX, use `{/* text */}`)
> 1 | <!--
| ^
2 | <<< Author notes: Header of the course >>>
3 | Include a 1280×640 image, course title in sentence case, and a concise description in emphasis.
More information: https://mdxjs.com/docs/troubleshooting-mdx